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Radeon HD 6670 (OEM) 1GB vs Radeon HD 7750

Intro

The Radeon HD 6670 (OEM) 1GB uses a 40 nm design. AMD has set the core frequency at 800 MHz. The GDDR5 RAM is set to run at a speed of 1000 MHz on this card. It features 480 SPUs as well as 24 TAUs and 8 Rasterization Operator Units.

Compare those specifications to the Radeon HD 7750, which features clock speeds of 800 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 RAM. It features 512 SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750 55 Watts
Radeon HD 6670 (OEM) 1GB 63 Watts
Difference: 8 Watts (15%)

Memory Bandwidth

In theory, the Radeon HD 7750 should be 13% quicker than the Radeon HD 6670 (OEM) 1GB overall, because of its higher data rate. (explain)

Radeon HD 7750 72000 MB/sec
Radeon HD 6670 (OEM) 1GB 64000 MB/sec
Difference: 8000 (13%)

Texel Rate

The Radeon HD 7750 is quite a bit (about 33%) faster with regards to AF than the Radeon HD 6670 (OEM) 1GB. (explain)

Radeon HD 7750 25600 Mtexels/sec
Radeon HD 6670 (OEM) 1GB 19200 Mtexels/sec
Difference: 6400 (33%)

Pixel Rate

The Radeon HD 7750 will be quite a bit (more or less 100%) faster with regards to FSAA than the Radeon HD 6670 (OEM) 1GB, and capable of handling higher resolutions better. (explain)

Radeon HD 7750 12800 Mpixels/sec
Radeon HD 6670 (OEM) 1GB 6400 Mpixels/sec
Difference: 6400 (100%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Radeon HD 6670 (OEM) 1GB

Amazon.com

Radeon HD 7750

Amazon.com

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

Model Radeon HD 6670 (OEM) 1GB Radeon HD 7750
Manufacturer AMD AMD
Year February 2011 February 2012
Code Name Turks Cape Verde Pro
Fab Process 40 nm 28 nm
Bus PCIe 2.1 x16 PCIe 3.0 x16
Memory 1024 MB 1024 MB
Core Speed 800 MHz 800 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1000 MHz (4000 MHz effective) 1125 MHz (4500 MHz effective)
Unified Shaders 480 512
Texture Mapping Units 24 32
Render Output Units 8 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2
Power (Max TDP) 63 watts 55 watts
Shader Model 5.0 5.0
Bandwidth 64000 MB/sec 72000 MB/sec
Texel Rate 19200 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 6400 Mpixels/sec 12800 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of data (measured in megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the card's interface width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

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